text: /*
  // Copyright (c) 2010-2017 Intel Corporation
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  */
  
  #include <rte_mbuf.h>
  
  #include "task_init.h"
  #include "task_base.h"
  #include "lconf.h"
  #include "log.h"
  #include "prox_port_cfg.h"
  
  struct task_l2fwd {
  	struct task_base base;
  	uint8_t src_dst_mac[12];
  	uint32_t runtime_flags;
  };
  
  static int handle_l2fwd_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
  {
  	struct task_l2fwd *task = (struct task_l2fwd *)tbase;
  	prox_rte_ether_hdr *hdr;
  	prox_rte_ether_addr mac;
  
  	if ((task->runtime_flags & (TASK_ARG_DST_MAC_SET|TASK_ARG_SRC_MAC_SET)) == (TASK_ARG_DST_MAC_SET|TASK_ARG_SRC_MAC_SET)) {
  		/* Source and Destination mac hardcoded */
  		for (uint16_t j = 0; j < n_pkts; ++j) {
  			hdr = rte_pktmbuf_mtod(mbufs[j], prox_rte_ether_hdr *);
                 		rte_memcpy(hdr, task->src_dst_mac, sizeof(task->src_dst_mac));
  		}
  	} else {
  		for (uint16_t j = 0; j < n_pkts; ++j) {
  			hdr = rte_pktmbuf_mtod(mbufs[j], prox_rte_ether_hdr *);
  			if ((task->runtime_flags & (TASK_ARG_DO_NOT_SET_SRC_MAC|TASK_ARG_SRC_MAC_SET)) == 0) {
  				/* dst mac will be used as src mac */
  				prox_rte_ether_addr_copy(&hdr->d_addr, &mac);
  			}
  
  			if (task->runtime_flags & TASK_ARG_DST_MAC_SET)
  				prox_rte_ether_addr_copy((prox_rte_ether_addr *)&task->src_dst_mac[0], &hdr->d_addr);
  			else if ((task->runtime_flags & TASK_ARG_DO_NOT_SET_DST_MAC) == 0)
  				prox_rte_ether_addr_copy(&hdr->s_addr, &hdr->d_addr);
  
  			if (task->runtime_flags & TASK_ARG_SRC_MAC_SET) {
  				prox_rte_ether_addr_copy((prox_rte_ether_addr *)&task->src_dst_mac[6], &hdr->s_addr);
  			} else if ((task->runtime_flags & TASK_ARG_DO_NOT_SET_SRC_MAC) == 0) {
  				prox_rte_ether_addr_copy(&mac, &hdr->s_addr);
  			}
  		}
  	}
  	return task->base.tx_pkt(&task->base, mbufs, n_pkts, NULL);
  }
  
  static void init_task_l2fwd(struct task_base *tbase, struct task_args *targ)
  {
  	struct task_l2fwd *task = (struct task_l2fwd *)tbase;
  	prox_rte_ether_addr *src_addr, *dst_addr;
  
  	/*
  	 * The destination MAC of the outgoing packet is based on the config file:
  	 *    - 'dst mac=xx:xx:xx:xx:xx:xx' => the pre-configured mac will be used as dst mac
  	 *    - 'dst mac=packet'            => the src mac of the incoming packet is used as dst mac
  	 *    - 'dst mac=no'                => the dst mac is untouched
  	 *    - (default - no 'dst mac')    => the src mac from the incoming packet is used as dst mac
  	 *
  	 * The source MAC of the outgoing packet is based on the config file:
  	 *    - 'src mac=xx:xx:xx:xx:xx:xx' => the pre-configured mac will be used as src mac
  	 *    - 'src mac=packet'            => the dst mac of the incoming packet is used as src mac
  	 *    - 'src mac=hw'                => the mac address of the tx port is used as src mac
  	 *                                     An error is returned if there are no physical tx ports
  	 *    - 'src mac=no'                => the src mac is untouched
  	 *    - (default - no 'src mac')    => if there is physical tx port, the mac of that port is used as src mac
  	 *    - (default - no 'src mac')       if there are no physical tx ports the dst mac of the incoming packet
                                                      is used as src mac
  	 */
  
  	if (targ->flags & TASK_ARG_DST_MAC_SET) {
  		dst_addr = &targ->edaddr;
  		memcpy(&task->src_dst_mac[0], dst_addr, sizeof(*src_addr));
  	}
  
  	if (targ->flags & TASK_ARG_SRC_MAC_SET) {
  		src_addr =  &targ->esaddr;
  		memcpy(&task->src_dst_mac[6], src_addr, sizeof(*dst_addr));
  		plog_info("\t\tCore %d: src mac set from config file\n", targ->lconf->id);
  	} else if ((targ->flags & TASK_ARG_DO_NOT_SET_SRC_MAC) == 0) {
  		if (targ->flags & TASK_ARG_HW_SRC_MAC)
  			PROX_PANIC(targ->nb_txports == 0, "src mac set to hw but no tx port\n");
  		if (targ->nb_txports) {
  			src_addr = &prox_port_cfg[task->base.tx_params_hw.tx_port_queue[0].port].eth_addr;
  			targ->flags |= TASK_ARG_SRC_MAC_SET;
  			plog_info("\t\tCore %d: src mac set from port\n", targ->lconf->id);
  			memcpy(&task->src_dst_mac[6], src_addr, sizeof(*dst_addr));
  		}
  	}
  	task->runtime_flags = targ->flags;
  }
  
  static struct task_init task_init_l2fwd = {
  	.mode_str = "l2fwd",
  	.init = init_task_l2fwd,
  	.handle = handle_l2fwd_bulk,
  	.flag_features = TASK_FEATURE_NEVER_DISCARDS|TASK_FEATURE_TXQ_FLAGS_NOOFFLOADS,
  	.size = sizeof(struct task_l2fwd),
  };
  
  __attribute__((constructor)) static void reg_task_l2fwd(void)
  {
  	reg_task(&task_init_l2fwd);
  }
  